aes-armv4.pl: make it more foolproof [inspired by aes-s390x.pl in 1.0.1].

crypto/aes/asm/aes-armv4.pl

@@ -408,6 +408,7 @@ _armv4_AES_encrypt:
 .type   AES_set_encrypt_key,%function
 .align	5
 AES_set_encrypt_key:
+_armv4_AES_set_encrypt_key:
 	sub	r3,pc,#8		@ AES_set_encrypt_key
 	teq	r0,#0
 	moveq	r0,#-1
@@ -425,7 +426,7 @@ AES_set_encrypt_key:
 	bne	.Labrt
 
 .Lok:	stmdb   sp!,{r4-r12,lr}
-	sub	$tbl,r3,#AES_set_encrypt_key-AES_Te-1024	@ Te4
+	sub	$tbl,r3,#_armv4_AES_set_encrypt_key-AES_Te-1024	@ Te4
 
 	mov	$rounds,r0		@ inp
 	mov	lr,r1			@ bits
@@ -685,7 +686,7 @@ AES_set_encrypt_key:
 .align	5
 AES_set_decrypt_key:
 	str	lr,[sp,#-4]!            @ push lr
-	bl	AES_set_encrypt_key
+	bl	_armv4_AES_set_encrypt_key
 	teq	r0,#0
 	ldrne	lr,[sp],#4              @ pop lr
 	bne	.Labrt